diff --git a/i3bar/src/xcb.c b/i3bar/src/xcb.c
index a29f9094..2d33919e 100644
--- a/i3bar/src/xcb.c
+++ b/i3bar/src/xcb.c
@@ -1290,6 +1290,7 @@ void clean_xcb(void) {
     FREE(outputs);
 
     xcb_flush(xcb_connection);
+    xcb_aux_sync(xcb_connection);
     xcb_disconnect(xcb_connection);
 
     ev_check_stop(main_loop, xcb_chk);